Before working with this product, you must read and become familiar with the available information regarding its risks, proper use, and safe handling. This information is provided in various formats, including the current Safety Data Sheet (SDS) and product label. SDS can be accessed via the following link:
Safety Data Sheets (SDS) for Covestro products | Covestro
For further questions, please use the contact information provided on this technical data sheet.
Product description
Water-reducible, hydroxyfunctional polyacrylic dispersion.
In combination with aliphatic polyisocyanates to formulate aqueous two-component clear- and topcoats for vehicle repair applications, heavy transport finishing and industrial coating.In combination with amino resins or blocked polyisocyanates for waterborne, one-component, industrial baking coatings.
Applications
General
Bayhydrol® A 145 is a hydroxyfunctional polyacrylic dispersion which can be thinned with water to application viscosity.
Bayhydrol® A 145 has good pigment wetting properties and high shear stability. Bead mills have proved suitable as grinding equipment. Only pigments and extenders with a minimal water-soluble content should be used.
Given the many pigments and extenders available, compatibility testing should always be carried out.
Application and formulation equipment can be cleaned with water, alkaline cleaning agents or isopropanol.
Two-component industrial coatings
Bayhydrol® A 145 combined with aliphatic polyisocyanates yields high-gloss topcoats which can be dried at room temperature or force-dried, e.g. at 80 °C. The cured paint films are hard and flexible with good single-coat adhesion and good resistance to solvents and water.
When mixing Bayhydur® or Desmodur® into the mill base, a thickener must be added to ensure a high shear effect.
The addition of approx. 0.3 % Acrysol® RM 8 (calculated on the solid binder) has proved suitable for formulations based on Bayhydrol® A 145.
One-component industrial baking coatings
Bayhydrol® A 145 can be used in combination with melamine resins for the formulation of baking coatings with < 5 % co-solvent at application viscosity. The systems cure in as little as 30 min at 120 °C. The ratio of Bayhydrol® A 145 to amino resin (solids on solids) is generally 80 : 20. Given the many amino resins available, compatibility testing should always be carried out.
As a hydroxyfunctional binder, Bayhydrol® A 145 is also suitable as a co-reactant for waterborne aliphatic polyisocyanates. The OH : NCO ratio should be 1 : 1.
To ensure the storage stability of one-component coating systems based on Bayhydrol® A 145, the pH should be set to approx. 8.5 during formulation.
Form supplied
Approx. 45% in water / SN 100 / 2-butoxyethanol, dimethyl ethanol amine neutralized, 4% SN 100, 4% 2-butoxyethanol.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | 1,0 g / 60 min / 125°C | 43.0 - 47.0 | % | M020 - ISO 3251 |
| Dynamic viscosity | D = 40 1/s / 23°C | 400 - 1,500 | mPa·s | M014 - ISO 3219/A.3 |
| Acid value | 7 - 13 | mg KOH/g | M019 - ISO 2114 | |
| pH-value | 7.2 - 8.2 | M022 - ISO 976 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Density | at 20 °C | approx. 1,06 | g/ml | DIN EN ISO 2811-2 |
| OH % on solid | approx. 3,3 | % | calculated |
Solubility / thinnability
Bayhydrol® A 145 can be thinned with water. It has only partial compatibility with glycol ethers and glycol ether esters.
Compatibility
Suitable co-reactants for the formulation of waterborne two-component polyurethane systems are aliphatic polyisocyanates such as Desmodur® ultra N 3300, ultra 3600, Bayhydur® 302, ultra 304, ultra 305 and ultra 401-70.
Storage
- Storage in original sealed Covestro container.
- Recommended storage temperature: > 0 ≤ 30 °C.
- Protect from frost, heat and foreign material.
General information: Short-time cooling down to -18 °C does not typically damage the product, but the viscosity may increase significantly. Prolonged freezing can damage the product irreversibly.
The viscosity of the product is largely governed by the pH. As the pH may decrease during storage, a decrease in viscosity is also to be expected. The viscosity can be restored to its original value by the addition of small amounts of an aqueous 10 % solution of dimethylethanolamine. Prolonged storage at higher temperatures may result in a decrease of viscosity and/or an increase of average particle size, possibly resulting in sedimentation or coagulation. Contamination with certain bacteria, fungi or algae may render the product unusable.
Storage time
Covestro represents that, for a period of six months following the day of shipment as stated in the respective transport documents, the product will meet the specifications or values set forth in section "specifications or characteristic data" above, what ever is applicable, provided that the product is stored in full compliance with the storage conditions set forth in and referenced under section "storage" above and is otherwise handled appropriately.
The lapse of the six months period does not necessarily mean that the product no longer meets specifications or the set values. However, prior to using said product, Covestro recommends to test such a product if it still meets the specifications or the set values. Covestro does not make any representation regarding the product after the lapse of the six months period and Covestro shall not be responsible or liable in any way for the product failing to meet specifications or the set values after the lapse of the six months period.
Health and Safety Information
Disclaimer
Responsibility and Liability
The use of Covestro products, technical assistance, and information (regardless of how provided) is outside Covestro’s control and is solely the responsibility of the customer. The customer must conduct adequate testing to determine the suitability of products for its intended use, including but not limited to technical, health, safety, and environmental aspects. Unless otherwise agreed in writing, all products are sold exclusively under Covestro’s standard conditions of sale, which prevail in case of conflict and are available upon request.
The terms and conditions of sale and delivery are available via the following link:
https://order.covestro.com/covestrostorefront/saleConditions
All information is provided “as is” without warranties, express or implied, including merchantability or fitness for a particular purpose, and is subject to change without notice. To the maximum extent permitted by law, Covestro disclaims, and the customer assumes all liability for losses, damages, or claims arising out of use of Covestro products, technical assistance, or information. Any statement or recommendation not expressly contained in Covestro documentation is unauthorized and shall not bind Covestro. Nothing herein shall be construed as encouraging or recommending the use of any product in conflict with any claim of any patent. No license is implied or in fact granted under the claims of any patent.
Restrictions on Regulated Applications
This product is not intended for use in regulated applications such as agriculture, cosmetics, drinking water contact, food contact, medical products (e.g., medical devices), toys, or similar uses subject to specific regulatory requirements. Prior written approval from Covestro is required before this product may be used in any regulated application. The customer is solely responsible for ensuring compliance with all applicable laws and determining product suitability. Covestro disclaims all liability and warranties for unauthorized regulated uses.
Typical Value
The values provided are typical only and do not represent binding specifications. Unless expressly confirmed in a written contract, these values are not part of the contractual quality agreement and must not be relied upon as a warranty or guarantee of product performance.
Sample
Samples provided by Covestro are intended solely for evaluation and testing purposes by the customer and may not be used in commercial applications, resold, transferred to third parties (except qualified testing service providers acting on behalf of the customer), reverse engineered, modified, or used in any manner not explicitly authorized in writing by Covestro. Samples are provided ‘as-is’ without any warranties, express or implied, including fitness for a particular purpose. Customers are solely responsible for ensuring safe handling, regulatory compliance, and suitability of the material for their intended evaluations. Covestro disclaims all liability for damages or losses arising from the use of samples.
Contact Information
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
